Please refer to the steps in the troubleshooting document. The fixture has been updated from what you'll see in the illustrations and pictures, but the troubleshooting steps are accurate:
Store Troubleshooting Guide
If you cannot restore functionality, please call 1.877.41.KIOSK to walk through some steps with MSFT.
Once MSFT has determined that the hardware has indeed failed, they will direct you back to us again to process a replacement order and an installation visit.